JPS61236461A - Cylinder block machining control device - Google Patents

Abstract

PURPOSE:To insure a cylinder block height having a fixed dimension by providing a cutter stroke correcting means to establish a height form the crank bearing hole of a cylinder block to a head surface to the fixed dimension. CONSTITUTION:In a crank bearing hole machining unit 3, the reference surface of the pallet on which a work is mounted, or the X, Y positions of the machined crank bearing hole is detected with a detecting gauge 3b. The detected position is compared with a reference position based on a setter 5a by a comparator 5b in a cutter position correcting device 5, and sent to a computer 5d through a register 5c. Cutter stroke correcting quantity is computed by the computer 5d, and sent to a cutter drive control section 4e. Thus, an error in the position of the crank bearing hole can be corrected for machining a head surface to insure a cylinder block height having a fixed dimension. An engine output can be therefore stabilized, and the assembly and sealing of the engine also improved.

Description

Detailed Description of the Invention [Field of Industrial Application] The present invention relates to a cylinder block machining control device for sequentially machining a crank bearing hole and a head surface on a cylinder block, and particularly relates to a cylinder block machining control device for sequentially machining a crank bearing hole and a head surface on a cylinder block. Regarding improving the dimensional accuracy of block height.

[Prior art]

Generally, a cylinder block of an engine has a bearing hole formed in its lower part for supporting a crankshaft, and a head surface for attaching a cylinder head to its upper surface. When machining the crank bearing hole and head surface, the block height, which is the distance between the two, affects the compression ratio and engine output, so the block height must be precisely machined to the specified dimensions. There is a need. In particular, the ■-type engine, which has recently become mass-produced, has the left and right cylinder heads mounted on the head surfaces of the left and right cylinder blocks, respectively, and the intake manifold is sandwiched between the left and right cylinder heads. In this V-type engine, in addition to stabilizing the compression ratio, the block is also used to improve the ease of assembling the cylinder block, cylinder head, and manifold, and to improve the sealing performance between these parts. It is necessary to improve the dimensional accuracy of height.

By the way, in machining such a cylinder block, the cylinder block is placed on a pallet, which is sequentially transferred to a crank bearing hole machining station and a head surface machining station by a conveyance device, and the side part of the conveyance line is machined at each station run. In this case, it is unavoidable that positioning errors occur during transportation.Therefore, conventionally, in the above-mentioned processing, errors in machining dimensions occur at each station. ,
There is a problem in that these particles tend to accumulate and become large.

Therefore, as a method to reduce variations in compression ratio etc. due to errors in processing dimensions, a conventional method has been proposed in Japanese Patent Application Laid-Open No. 59-142.
As described in Publication No. 028, the block height of the machined cylinder block, the crankshaft, the connecting rod,
Some systems measure the dimensions of the piston in the engine height direction and determine the optimal combination that will give the compression ratio a predetermined value, thereby stabilizing the compression ratio. However, this conventional method requires a dedicated station for measuring the dimensions of each part, and the assembly work is extremely complicated, resulting in a problem of poor work efficiency.

[Purpose of the invention]

The present invention has been made in view of these conventional problems, and allows the block height between the crank bearing hole and the head surface to be constant, thereby eliminating the need for a dedicated measurement station run like in the past. The object of the present invention is to provide a cylinder block processing control device that can stabilize output and improve assembly and sealing performance.

[Structure of the invention]

The present invention is a cylinder block machining control device for sequentially machining a crank bearing hole and a head surface of a cylinder block placed on a pallet. A detection means for detecting the position of the reference jig at least in the height direction is provided in the crank bearing hole machining unit, a cutter position control device is provided in the head surface machining unit, and a cutter stroke correction signal is provided to the cutter position control device. A cutter stroke correction means is provided to provide the following.

As a result, in the present invention, when machining the crankshaft hole, the reference jig position and eventually the crankshaft hole position are detected, and the block height is adjusted to a predetermined dimension according to the difference between the detected position information and the set reference position information. A cutter stroke correction signal is created, and the cutter stroke during head surface processing is adjusted using this cutter stroke correction signal.

〔Example〕

Embodiments of the present invention will be described below with reference to the drawings.

1 to 4 show an apparatus according to an embodiment of the present invention. In the figures, the apparatus according to the present invention includes a pallet 2, a cylinder block 1, a workpiece, and a pallet 2 for transporting a cylinder block 1, which is a workpiece, to each processing station. Crank bearing hole machining unit 3 for machining the crank bearing hole in the cylinder block 1. A head surface processing unit 4 for processing the head surface of the cylinder block 1, and a cutter for adjusting the height between the crank bearing hole and the head surface, that is, the block height, to a predetermined dimension when processing the head surface by the unit 4. A cutter position correction device 5 that provides a stroke correction signal to the head surface processing unit 4.
It is composed of. Here, the cylinder block 1 of this embodiment has a bank angle of 60°.

This is a cylinder block for a 6-cylinder engine, and the block height is the same.

The pallet 2 is a plate-shaped body with a rectangular plane, and the lower surface thereof has four processing reference surfaces 2a, as shown in FIG.
Two processing reference dowel holes 2b are formed, and a support jig 2C for positioning and mounting the cylinder block 1 is attached to the upper surface thereof. The support jig 2c
A reference jig 2d in which a machining reference hole 2e is formed is attached to the top, and the axis of the machining reference hole 2e is aligned with the virtual axis of the crank bearing hole to be machined in the cylinder block 1. There is.

The crank bearing hole machining unit 3 performs crank bearing hole machining by cutting the cylinder block I so that the crank bearing hole portion thereof has a predetermined diameter using a horizontally extending polling quill 3a. The quill 3a of the processing unit 3 is rotationally driven while moving back and forth in the horizontal direction at positions X and Y from predetermined external reference planes BX and BY shown in FIG.

An annular detection gauge 3b is attached to the polling quill 3a so as to be movable back and forth in conjunction with the quill 3a, but not rotatable, and the gauge 3b has three detection parts 3c that protrude and retract in the radial direction. The detection gauge 3b is freely disposed on the external reference surface BX of the machining reference hole 2e of the reference jig 2d.

This is to detect the position in the X and Y directions from BY. Note that 3e is an indicator that displays the output of the detection gauge 3b.

The head surface processing unit 4 includes a main shaft drive motor 4b that rotationally drives a main shaft supporting the cutter 4a, an X-direction feed motor 4C and a Y-direction feed motor 4d for moving the main shaft in the X direction and the Y direction, and these motors. A cutter drive control section 4e is provided to control starting and stopping of each of the motors 4b to 4d.

Further, the force lid position correction device 5 is disposed in a control panel (not shown) disposed in the head surface machining station, and this is used for reference position setting 1B5a and comparison fi5.
b, a register 5c, and a stroke correction amount calculator 5d. The reference position setter 5a is
This is for setting the reference position at which the reference jig 2d is to be positioned when the pallet 2 is transferred to the crankshaft hole machining station, and the comparison 15b is compared with the reference position information set by the reference position setting device 5a. , and the detected position information from the detection gauge 3b to determine the amount of deviation of the pallet 2 from the reference position, and the amount of deviation is stored in the register 5c. The stroke correction amount calculator 5d generates a stroke correction signal A for adjusting the block height of the cylinder block 1 to a predetermined dimension according to the amount of deviation from the register 5c, that is, the Y-direction feed motor 4d of the head surface machining unit 4. It is configured to output a signal for correcting the feed amount.

Next, the effects will be explained.

Here, FIGS. 5 to 7 are for explaining the operation of this embodiment. In crankshaft hole machining, the pallet 2 is first moved by a conveyance device to a predetermined position in the crankshaft hole machining station, that is, on the above-mentioned virtual axis. The mind is the external reference plane BX,
The pallet 2 is positioned with the target position being X and Y from BY, but in this case, assume that the pallet 2 is positioned at a position that is X from the reference plane BX and ΔY lower than the reference plane BY. Even in this case, the quill 3a of the crank bearing hole machining unit 3 is BX, BY is X.

Since the cylinder block 1 is transferred in the horizontal direction while being rotationally driven at the Y position, the cylinder block 1 is moved by ΔY from the above-mentioned virtual axis.
A bearing hole 1a is formed in the upper part of the bearing hole 1a. In this case, when the quill 3a passes through the machining reference hole 2e of the reference jig 2d and is inserted into the crank bearing hole of the cylinder pro-nk 1, the detection part 3C of the detection gauge 3b meets the inner surface of the machining reference hole 2e. They come into contact with each other and move in and out, thereby detecting the position of the machined crank bearing hole, la, in the X and Y directions.

In this case, as mentioned above, pallet 2 is moved by ΔY from the normal position.
Since the machined crank bearing hole 1a is positioned lower than the regular crank bearing hole 1a' by ΔY
It is detected that it was formed at a higher position (Fig. 5,
(See Figure 7).

In the cutter position correction device 5, the reference position setting device 5a sets the reference position at which the cylinder block 1 is to be positioned at the crankshaft hole machining station;
In this case, the X and Y positions are set from BX and BY, respectively, and the set position information and the set position information are determined by the comparator 5b.
The detected position information by the detection gauge 3b is compared,
A deviation amount ΔY between the two is obtained, and this deviation amount ΔY is stored in the register 5c. Then, this deviation amount ΔY is determined by the stroke correction amount calculation 115d to the corrected stroke amount ΔL for making the block height from the crank bearing hole to the head surface L, in this case, ΔL−ΔYcos 30°
The stroke correction signal A is output.

At the head surface machining station, the cylinder block 1 is placed on the pallet 2 and moved 30 degrees to the right or left so that the line connecting the crank bearing hole 1a and one head surface 1b is perpendicular. rotated (Fig. 6(a)
), (b)), and cutter drive control section 4e to X
A direction control signal is given to the X direction feed motor 4c,
As a result, the cutter 4a is positioned vertically above the head surface 1b of the cylinder block 1. and cutter 4
a is rotationally driven by the main shaft drive motor 4b, and in this state, the Y-direction feed motor 4d is driven by the Y-direction control signal.
is started, and head surface processing is performed in this way.

At this time, when the cutter 4a is fed by the regular feed amount S in the Y-axis direction by the Y-direction feed motor 4d, the crank bearing hole of the cylinder block 1 is
Since a is formed at a position higher than the virtual axis by ΔY, the blocking height ends up being L-ΔL. However, in this embodiment, the feed amount of the canter 4a in the Y-axis direction is the normal feed due to the stroke correction signal A! The feed amount is corrected by subtracting ΔL from lS, and as a result, the block height L of the cylinder block 1 is ensured.

In this way, in this embodiment, the position of the crankshaft bearing hole 1a formed during crankshaft hole machining is detected, and the stroke correction amount ΔL is determined according to the difference between this detected position information and the set reference position information. Since the stroke S of the canter 4a is corrected using the stroke correction amount ΔL during head surface machining, a predetermined block height L can be secured, the compression ratio can be stabilized, and the cylinder head to the cylinder block 1 can be The ease of assembling the intake manifold can be improved.

In addition, in the above embodiment, the crank bearing hole 1 formed by processing is
Although the position of a in the X direction and the Y direction is detected, in the present invention, it is sufficient to detect at least the position in the Y direction, and the position in the X direction is not necessarily detected. In the case of detecting, it is sufficient to provide only one detection portion 3C of the detection gauge 3b at the upper part, and the reference jig 2d may have, for example, a long processing reference hole in the horizontal direction.

〔Effect of the invention〕

As described above, according to the cylinder block machining control device according to the present invention, a reference jig is provided on the pallet, and a detection means for detecting the position of the reference jig at least in the height direction is provided in the crank bearing hole machining unit, Since a cutter stroke correction means is provided to give a stroke correction signal to the cutter position control device of the head surface machining unit to adjust the height from the crank bearing hole of the cylinder block to the head surface to a predetermined dimension, the crank bearing hole position This error can be corrected during head surface machining to ensure a predetermined block height, stabilize engine output, and improve assembly and sealing performance.

[Brief explanation of the drawing]

Fig. 1 is a block diagram of a cylinder block machining control device according to an embodiment of the present invention, Fig. 2 is a perspective view of a crank bearing hole drilling machine, Fig. 3 is a front view of its reference jig and detection gauge, and Fig. 3 is a front view of the reference jig and detection gauge portion thereof. Figure 4 is a perspective view of the head surface processing station, Figures 5 to 7 are for explaining its operation, and Figures 5, 6 (a) and (b) are its cylinder block and pallet parts. The front view of FIG. 7 is a conceptual diagram thereof. 1... Cylinder block, 1a crank bearing hole, 1b
...Head surface, 2...Pallet, 2d...Reference jig, 3...Crank bearing hole machining unit, 3a...
Quill, 3b...detection gauge (detection means), 4...
Head surface processing unit, 4e...Cutter drive control unit (
cutter position control device), 5... cutter position correction device (
Stroke correction means), A... Stroke correction signal. Patent applicant: Mazda Motor Corporation agent, patent attorney Ken Hayase - Figure 4

Claims (1)

[Claims] (1) A cylinder block machining control device for sequentially machining crank bearing holes and head surface machining on cylinder blocks placed on pallets, each pallet having a specific positional relationship with the crank bearing holes of the cylinder block. A reference jig is provided at the crank bearing hole machining station, and a bearing hole machining unit is provided at the crank bearing hole machining station, which includes a detection means for detecting the position of the reference jig at least in the height direction when machining the crank bearing hole using a quill. The head surface processing station is provided with a head surface processing unit equipped with a cutter position control device for adjusting the cutter stroke, and the position information of the reference jig detected by the detection means is compared with the set reference position information, According to the difference, a stroke correction means is provided for supplying a stroke correction signal to the cutter position control device for adjusting the block height from the crank bearing hole to the head surface to a predetermined dimension during head surface machining. Characteristic cylinder block machining control device.